1 /* 2 * Author: Andy Fleming <afleming@freescale.com> 3 * Kumar Gala <galak@kernel.crashing.org> 4 * 5 * Copyright 2006-2008 Freescale Semiconductor Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12 13 #include <linux/stddef.h> 14 #include <linux/kernel.h> 15 #include <linux/init.h> 16 #include <linux/delay.h> 17 #include <linux/of.h> 18 19 #include <asm/machdep.h> 20 #include <asm/pgtable.h> 21 #include <asm/page.h> 22 #include <asm/mpic.h> 23 #include <asm/cacheflush.h> 24 #include <asm/dbell.h> 25 26 #include <sysdev/fsl_soc.h> 27 28 extern void __early_start(void); 29 30 #define BOOT_ENTRY_ADDR_UPPER 0 31 #define BOOT_ENTRY_ADDR_LOWER 1 32 #define BOOT_ENTRY_R3_UPPER 2 33 #define BOOT_ENTRY_R3_LOWER 3 34 #define BOOT_ENTRY_RESV 4 35 #define BOOT_ENTRY_PIR 5 36 #define BOOT_ENTRY_R6_UPPER 6 37 #define BOOT_ENTRY_R6_LOWER 7 38 #define NUM_BOOT_ENTRY 8 39 #define SIZE_BOOT_ENTRY (NUM_BOOT_ENTRY * sizeof(u32)) 40 41 static void __init 42 smp_85xx_kick_cpu(int nr) 43 { 44 unsigned long flags; 45 const u64 *cpu_rel_addr; 46 __iomem u32 *bptr_vaddr; 47 struct device_node *np; 48 int n = 0; 49 50 WARN_ON (nr < 0 || nr >= NR_CPUS); 51 52 pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr); 53 54 np = of_get_cpu_node(nr, NULL); 55 cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL); 56 57 if (cpu_rel_addr == NULL) { 58 printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr); 59 return; 60 } 61 62 /* Map the spin table */ 63 bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY); 64 65 local_irq_save(flags); 66 67 out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr); 68 out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start)); 69 70 /* Wait a bit for the CPU to ack. */ 71 while ((__secondary_hold_acknowledge != nr) && (++n < 1000)) 72 mdelay(1); 73 74 local_irq_restore(flags); 75 76 iounmap(bptr_vaddr); 77 78 pr_debug("waited %d msecs for CPU #%d.\n", n, nr); 79 } 80 81 static void __init 82 smp_85xx_setup_cpu(int cpu_nr) 83 { 84 mpic_setup_this_cpu(); 85 } 86 87 struct smp_ops_t smp_85xx_ops = { 88 .kick_cpu = smp_85xx_kick_cpu, 89 }; 90 91 void __init mpc85xx_smp_init(void) 92 { 93 struct device_node *np; 94 95 np = of_find_node_by_type(NULL, "open-pic"); 96 if (np) { 97 smp_85xx_ops.probe = smp_mpic_probe; 98 smp_85xx_ops.setup_cpu = smp_85xx_setup_cpu; 99 smp_85xx_ops.message_pass = smp_mpic_message_pass; 100 } 101 102 if (cpu_has_feature(CPU_FTR_DBELL)) 103 smp_85xx_ops.message_pass = smp_dbell_message_pass; 104 105 BUG_ON(!smp_85xx_ops.message_pass); 106 107 smp_ops = &smp_85xx_ops; 108 } 109